Form clamp



Jan. 15, 1929.

A. B. BLASER FORK cum Filed May 21, 1927 Patented Jan. 15, 1929.

UNITED STATES 1,698,931 FICE.

ALLEN B. BLASER, OF CHICAGO, ILLINOIS.

FORM CLAMP.

Application filed May 21,

My invention relates to a form clamp and has for its primary object the provision of a form clamp which is applied around the forms used particularly in concrete work, and which is adapted to all forms of columns and beams regardless of the shape of the form upon which the clamp is used.

Another and further object of my invention is the provision of a form clamp which is easily attached to the form and which is adapted to be drawn tightlyaround the form and to hold the form in position during the pouring of the concrete.

Another and further object of my invention is the provision of a form clamp which can easily be tightened after being applied to a form, thereby preventing bulging or bursting of the form, and can also be readily detached from the form for the removal of the form from the concrete column or pillar without destroying the clamp or rendering it unfit for use again.

Another and further object of my invention is the provision of a form clamp which is simple and easy to transport, can be qulckly applied, will not stretch in use, and is simple and economical and may be used over and over again as it is practically indestructible.

Another and further object of my invention is the provision of a form clamp which is flexible and is adapted to conform to the irregular contour of the outer sides of the concrete forms without the use of wedges or other blocking means usually common in forms of this character.

These and other objects will be more fully and better understood by reference to the accompanying drawings, in which Figure 1 is an elevational view of a form clamp showing the holding member attached thereto.

Figure 2 is a view partially in elevation and partially in section showing the form clamp attached to an octagonal form;

Figure 3 is a view of the form clamp applied to a square form; and

Figure 4 is a detailed sectional view through the holding and tightening hook on lines 44 of Figure 1.

Referring now specifically tothe drawings in which like reference characters refer to like parts, I provide a chain 10 of any desired length and weight, depending upon the particular size of the forms with which it is intended to be used, at one end of which I provide a slip hook 11, through whlch the 1927. Serial No. 193,261.

free end of the chain 10 is adapted to be passed, the chain 10 being made in various lengths depending upon the size of the forms it is adapted to encircle. Near the free end ofthe chain 10, I attach a holding and tightening hook 12 by means of a short chain 13, one end link of which is secured t-o-one of the links making up the chain 10, and the other link is secured to a clevis 14 which is secured to the holding and tightening hook 12 by means of a rivet or bolt 15. The hook 12 has a handle portion 16 and has an extended or nose portion comparatively long, 17, adjacent the link receiving recess 18, one side 19 of the nose portion 17 being tapered so as to act as a wedge when the hook 12 is inserted over one of the links in the chain 10 and between the adjacent link and the slip hook 11. The hook 12 is also tapered 01f at 20 adjacent the inner edge of the recess 18 so asto assist in the insertion of the hook over one of the links in thechain 10.

In Figures 2 and 3 is illustrated an application of the device, in which a concrete form 21, which is octagonal in cross sectional shape, is shown surrounding the concrete filling 22, showing the method employed for drawing up the chain around the form 21. In Figure 3 is illustrated an application of the clamp to a form 23 which is square in cross sectional shape, and to which bats 24, 24 are applied with the chain 10 extending around the bats 24.

In the use and application of the device, the chain 10 is passed around the form and the free end thereof passed through the slip hook 11 and the chain drawn up as tightly as may be by hand. Thereupon the hook 12 is applied over one of the links of the chain 10 with the tapered side 20 and pointed end 19 of the hook acting as a wedge for the insertion of the hook, or the hook may be driven on with a hammer if desired between one of the links and the slip hook 11, when the operator grasps the outer end of the handle 16 and by pulling the end of the lever outward, the chain 10. is drawn through the slip hook 11 to the extent of one link, and as this link is drawn through the hook, the link is slightly turned so as to hold the clamp in posit-ion, the hook 12 is loosened and it is driven between the outer face of the slip hook 11 and the link which has been drawn through the slip hook 11 until the form clamp is drawn up as tightly as may be desired. The hook 12 is thereupon allowed to remain in position until it is desired to remove the form from the concrete column, whereupon the outer end of the handle 16 is struck a longitudinal blow driving the hook 12 off of the chain 1 -0, thus loosening the chain, allowing it to drop loose from the column.

While I have described more or less precisely the details of construction, I do not Wish to be understood as limiting myselt' thereto, as I contemplate changes in form and the proportion of parts and the substitution of equivalents as circumstances may suggest or render expedient without departing from the spirit or scope of my invention.

I claim:

1. A form clamp comprising in con1bination, a chain, a slip hook mounted on one end of the chain, and a holding and tightening hook adapted to cooperate with the sliphook and chain and havin a handle portion.

2. A'form clamp comprising in combination, a chain, a slip hook mounted on one end permanently connecting the holding and tightening-hook to the chain adjacent the slip hook 3. A form-clamp comprising in combination, a chain, a slip hook mounted on one end of the chain, and a holding and tightening hook, said hook having a tapered nose portion adapted'to actas a Wedge and a handle portion serving as a lever to insert the hook between the slip'hook-and chain and tighten the chain relative to the .sliphook.

4. A form clamp comprising in combination, a chain, a slip hook mounted on one end ofthe chain, a holding and tightening hook, said hook having a tapered nose portion adapted to act as a wedge and a handle portion serving as a lever to insert the hook be tween the slip hook and chain and tighten the chain relative to the slip hook, and a short length of chain securing the holding and tightening hook to the chain adjacent the slip hook.

Signed at Chicago, Illinois, this 18th day of May, 1927.

V ALLEN B. BLASER. 

